Re: [sqlite] Newbee Question
You have to link against sqlite's shared lib, e.g. in linux
$ gcc -L/path/to/sqlite/stuffs -I/path/to/sqlite/stuffs -lsqlite prog.c
(the 2nd is a capital i, the 3rd a small L)
Cheers,
M. Manese
On 4/4/07, nshaw [EMAIL PROTECTED] wrote:
I upgraded from 3.3.1.3 to 3.3.1.4. Up till now, I've been experimenting
with SQLite3 via the CLP. Now, I'm trying to access a DB via a C program
but I'm getting errors. Here's a small code fragment:
#include stdio.h
#include stdlib.h
#include sqlite3.h
int main (int argc, char **argv)
{
sqlite3 *db; /* from the definitive guide to sqlite */
char *zErr;
int rc;
char *sql;
rc = sqlite3_open (Family.db, db);
return 0;
}
The error I get is (.text+0x16): undefined reference to 'sqlite3_open'.
Any help will be greatly appreciated.
Thanks,
Nick.
--
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[sqlite] What query should I use?
Hi, I have a table with a following data: IdText1 Text2 Text3 Text4 --- 11001 11 test03 test13 21002 11 test01 test11 31003 12 test04 test12 41004 12 test02 test34 51004 12 test06 test56 61005 11 test17 test67 71005 12 test07 test57 81006 13 test05 test98 91007 13 test02 test93 10 1008 14 test01 test03 ... ..... .. Now, I would like to select only the rows when Text2 change. So the result of such query should look like: IdText1 Text2 Text3 Text4 --- 11001 11 test03 test13 31003 12 test04 test12 61005 11test17 test67 71005 12 test07 test57 81006 13 test05 test98 10 1008 14 test01 test03 ... ..... .. How should this query look like? Regards Wojciech W. - To unsubscribe, send email to [EMAIL PROTECTED] -
[sqlite] Re: What query should I use?
erw2 [EMAIL PROTECTED] wrote: I have a table with a following data: IdText1 Text2 Text3 Text4 --- 11001 11 test03 test13 21002 11 test01 test11 31003 12 test04 test12 41004 12 test02 test34 51004 12test06 test56 61005 11test17 test67 71005 12test07 test57 81006 13 test05 test98 91007 13 test02 test93 10 1008 14 test01 test03 ... ..... .. Now, I would like to select only the rows when Text2 change. So the result of such query should look like: IdText1 Text2 Text3 Text4 --- 11001 11 test03 test13 31003 12 test04 test12 61005 11 test17 test67 71005 12 test07 test57 81006 13 test05 test98 10 1008 14 test01 test03 ... ..... .. How should this query look like? select * from tableName t1 where t1.Text2 != ( select t2.Text2 from tableName t2 where t2.Id t1.Id order by t2.Id desc limit 1 ); Igor Tandetnik - To unsubscribe, send email to [EMAIL PROTECTED] -
[sqlite] Data integrity in extreme situations
Hi, I'm intending to use the SQLite database in a desktop e-mail application. Since most e-mails are quite valuable to me, I'd like to know if SQLite databases can get corrupted during normal use and exceptional situations like a sudden application/OS crash, power failure or access blocking through a virus scanner. Can it happen that under these circumstances all/arbitrary data from the database file can be lost or does that only affect the data currently being written, if any. How does it relate to transactions? I'm considering doing a full database backup each time the application quits but keeping the entire file twice may take much disk space. Maybe using two files, one for current e-mails and one as growing archive (that doesn't change often), would be a possibility. -- Yves Goergen LonelyPixel [EMAIL PROTECTED] Visit my web laboratory at http://beta.unclassified.de - To unsubscribe, send email to [EMAIL PROTECTED] -
Re: [sqlite] What query should I use?
try the DISTINCT keyword ? - Original Message - From: erw2 [EMAIL PROTECTED] To: sqlite-users@sqlite.org Sent: Wednesday, April 04, 2007 4:14 PM Subject: [sqlite] What query should I use? Hi, I have a table with a following data: IdText1 Text2 Text3 Text4 --- 11001 11 test03 test13 21002 11 test01 test11 31003 12 test04 test12 41004 12 test02 test34 51004 12test06 test56 61005 11test17 test67 71005 12test07 test57 81006 13 test05 test98 91007 13 test02 test93 10 1008 14 test01 test03 ... ..... .. Now, I would like to select only the rows when Text2 change. So the result of such query should look like: IdText1 Text2 Text3 Text4 --- 11001 11 test03 test13 31003 12 test04 test12 61005 11 test17 test67 71005 12 test07 test57 81006 13 test05 test98 10 1008 14 test01 test03 ... ..... .. How should this query look like? Regards Wojciech W. - To unsubscribe, send email to [EMAIL PROTECTED] - - To unsubscribe, send email to [EMAIL PROTECTED] -
Re: [sqlite] Data integrity in extreme situations
On 4/4/07, Yves Goergen [EMAIL PROTECTED] wrote: Hi, I'm intending to use the SQLite database in a desktop e-mail application. Since most e-mails are quite valuable to me, I'd like to know if SQLite databases can get corrupted during normal use and exceptional situations like a sudden application/OS crash, power failure or access blocking through a virus scanner. Can it happen that under these circumstances all/arbitrary data from the database file can be lost or does that only affect the data currently being written, if any. How does it relate to transactions? I'm considering doing a full database backup each time the application quits but keeping the entire file twice may take much disk space. Maybe using two files, one for current e-mails and one as growing archive (that doesn't change often), would be a possibility. if it is any consolation/encouragement, Apple's Mail.app version 2.x onward use SQLite as the data store. -- Puneet Kishor http://punkish.eidesis.org/ Nelson Inst. for Env. Studies, UW-Madison http://www.nelson.wisc.edu/ Open Source Geospatial Foundation http://www.osgeo.org/education/ - collaborate, communicate, compete = - To unsubscribe, send email to [EMAIL PROTECTED] -
[sqlite] SQL and SQLite pronounciation?
Hi All, I have a simple question; how do you pronounce SQL and SQLite? I have heard some people pronounce SQL like sequel, others like squeal, and others like three words ess cue el. Which do you prefer? How about SQLite? Is it ess cue light or something else like sequel light? I prefer ess cue el and ess cue light myself. Dennis Cote - To unsubscribe, send email to [EMAIL PROTECTED] -
Re: [sqlite] SQL and SQLite pronounciation?
On 4/4/07, Dennis Cote [EMAIL PROTECTED] wrote: Hi All, I have a simple question; how do you pronounce SQL and SQLite? See-quell See-que-lite -- Puneet Kishor http://punkish.eidesis.org/ Nelson Inst. for Env. Studies, UW-Madison http://www.nelson.wisc.edu/ Open Source Geospatial Foundation http://www.osgeo.org/education/ - collaborate, communicate, compete = - To unsubscribe, send email to [EMAIL PROTECTED] -
Re: [sqlite] SQL and SQLite pronounciation?
I prefer the ess cue ell version. And I can never remmeber that there is only one el, so I end up saying ess cue ell light even though I know its wrong. -- Joel Cochran On 4/4/07, Dennis Cote [EMAIL PROTECTED] wrote: Hi All, I have a simple question; how do you pronounce SQL and SQLite? I have heard some people pronounce SQL like sequel, others like squeal, and others like three words ess cue el. Which do you prefer? How about SQLite? Is it ess cue light or something else like sequel light? I prefer ess cue el and ess cue light myself. Dennis Cote - To unsubscribe, send email to [EMAIL PROTECTED] -
Re: [sqlite] SQL and SQLite pronounciation?
On 4/4/07, Joel Cochran [EMAIL PROTECTED] wrote: I prefer the ess cue ell version. And I can never remmeber that there is only one el, so I end up saying ess cue ell light even though I know its wrong. Join the club, Joel. I do the same, myself. With the only difference that I pronounce the 'S' 'Q' and 'L' letters in Portuguese. Cheers -- Alberto Simões - To unsubscribe, send email to [EMAIL PROTECTED] -
[sqlite] Math functions
Does anyone know if there is a floor function in sqlite, or of a way to implement it.
Re: [sqlite] Math functions
yes you can implement math functions with user defined functions by the sqlite3_create_function. sqlite.org is your freind :) 2007/4/4, Nathan Biggs [EMAIL PROTECTED]: Does anyone know if there is a floor function in sqlite, or of a way to implement it.
[sqlite] sqlite server
I've revived the sqlite server demo at http://www.it77.de/sqlite/sqlite.htm and updated the API to sqlite 3. This project defines a very simple sqlite server which operates local sqlite databases, and a simple client which links with a lightweight library containing a plug-compatible subset of the full sqlite C api. Essentially, if you have a simple enough program which uses sqlite, you can link with this library instead and connect to a remote sqlite database. There are many reasons why this simple client/server pair is ONLY a demo, and not suitable to be deployed outside of your sandbox; but there are also plenty of reasons why a networked sqlite might be preferable to a standard networked database such as mysl. -- OK, that's the announcement, now for the question. I'm planning to make this demo available, but if a show of hands indicates enough immediate interest, this could be set up at sourceforge or elsewhere as a real project. Please send ddyer-sqlite at real-me.net a message (no need to flood the mailing list) if you (a) would like a copy to play with (b) would be interested in participating in an open source project to make a deployable network database. - To unsubscribe, send email to [EMAIL PROTECTED] -
Re: [sqlite] SQL and SQLite pronounciation?
S. Q. Lite... that is my pronunciation and as I read in a book that is its pronunciation On 04/04/07, Alberto Simões [EMAIL PROTECTED] wrote: On 4/4/07, Joel Cochran [EMAIL PROTECTED] wrote: I prefer the ess cue ell version. And I can never remmeber that there is only one el, so I end up saying ess cue ell light even though I know its wrong. Join the club, Joel. I do the same, myself. With the only difference that I pronounce the 'S' 'Q' and 'L' letters in Portuguese. Cheers -- Alberto Simões - To unsubscribe, send email to [EMAIL PROTECTED] - -- Cesar Rodas http://www.cesarodas.com/ Mobile Phone: 595 961 974165 Phone: 595 21 645590 [EMAIL PROTECTED] [EMAIL PROTECTED]
RE: [sqlite] SQL and SQLite pronounciation?
re: S. Q. Lite... that is my pronunciation... And calling it squirrelite is simply a tongue-in-cheek affectionate affectation ;-) - To unsubscribe, send email to [EMAIL PROTECTED] -
Re: [sqlite] SQL and SQLite pronounciation?
I use a twist on the various versions listed so far: es cue el-ait. Hearing sequel for SQL always makes me cringe. Dennis Cote wrote: I have a simple question; how do you pronounce SQL and SQLite? -- Martin Pelletier Informatique / Software Development Infodev Electronic Designers International Inc. Tel : +1 (418) 681-3539, poste /ext. 114 Fax : +1 (418) 681-1209 - To unsubscribe, send email to [EMAIL PROTECTED] -
Re: [sqlite] SQL and SQLite pronounciation?
Personally, I use sequel and sequel-light. I think I remember from DRH's Google presentation video he uses ess cue el ite for his product. -Clark - Original Message From: Dennis Cote [EMAIL PROTECTED] To: sqlite-users sqlite-users@sqlite.org Sent: Wednesday, April 4, 2007 1:24:39 PM Subject: [sqlite] SQL and SQLite pronounciation? Hi All, I have a simple question; how do you pronounce SQL and SQLite? I have heard some people pronounce SQL like sequel, others like squeal, and others like three words ess cue el. Which do you prefer? How about SQLite? Is it ess cue light or something else like sequel light? I prefer ess cue el and ess cue light myself. Dennis Cote - To unsubscribe, send email to [EMAIL PROTECTED] - - To unsubscribe, send email to [EMAIL PROTECTED] -
Re: [sqlite] Re: SQL help
Igor, Amazing. Thanks very much for your help. You get credit in my code comments :-)) -Clark - Original Message From: Igor Tandetnik [EMAIL PROTECTED] To: SQLite sqlite-users@sqlite.org Sent: Tuesday, April 3, 2007 12:20:57 PM Subject: [sqlite] Re: SQL help Clark Christensen cdcmicro-/[EMAIL PROTECTED] wrote: I have a table, as described below, where I need to find out if the tech_id in question has at least some modules in a particular collection (coll_id), and they're all complete. select coalesce(min(is_complete), 0) from tech_modules where tech_id=? and coll_id=?; This returns 0 if there's at least one record with is_complete=0 (min will select it), or if there are no matching records at all (min will produce NULL, coalesce will convert it to 0). Igor Tandetnik - To unsubscribe, send email to [EMAIL PROTECTED] - - To unsubscribe, send email to [EMAIL PROTECTED] -
Re: [sqlite] SQL and SQLite pronounciation?
On Wednesday, April 04, 2007 Martin Pelletier wrote: I use a twist on the various versions listed so far: es cue el-ait. Hearing sequel for SQL always makes me cringe. Yeah. In some circles, sequel is reserved for the original SEQUEL query language were first published in 1974 by Don Chamberlin and Ray Boyce at the ACM–SIGFIDET Workshop on Data Description, whereas ess cue ell is used for subsequent standardized versions of the language. e -- Doug Currie Londonderry, NH, USA - To unsubscribe, send email to [EMAIL PROTECTED] -
[sqlite] Re: Math functions
Nathan Biggs [EMAIL PROTECTED] wrote: Does anyone know if there is a floor function in sqlite, or of a way to implement it. cast(expr as integer) truncates towards zero, in case it helps. Igor Tandetnik - To unsubscribe, send email to [EMAIL PROTECTED] -
Re: [sqlite] Math functions
Please see http://sqlite.org/contrib under extension-functions.tgz. On 4/4/07, Nathan Biggs [EMAIL PROTECTED] wrote: Does anyone know if there is a floor function in sqlite, or of a way to implement it.
Re: [sqlite] Data integrity in extreme situations
Yves Goergen [EMAIL PROTECTED] wrote: Hi, I'm intending to use the SQLite database in a desktop e-mail application. Since most e-mails are quite valuable to me, I'd like to know if SQLite databases can get corrupted during normal use and exceptional situations like a sudden application/OS crash, power failure or access blocking through a virus scanner. Can it happen that under these circumstances all/arbitrary data from the database file can be lost or does that only affect the data currently being written, if any. How does it relate to transactions? I'm considering doing a full database backup each time the application quits but keeping the entire file twice may take much disk space. Maybe using two files, one for current e-mails and one as growing archive (that doesn't change often), would be a possibility. SQLite is highly resistant to corruption resulting for an Application crash, OS crash, or power failure. But that doesn't mean it never happens. Read more at http://www.sqlite.org/lockingv3.html, especially section 6.0: How To Corrupt Your Database Files. There have been bugs in SQLite that have caused corruption. For a list of them, see http://www.sqlite.org/cvstrac/wiki?p=DatabaseCorruption I keep all of my email going back years in an SQLite database, FWIW. See http://www.sqlite.org/cvstrac/wiki?p=ExperimentalMailUserAgent It has already been reported that Apple Mail keeps all its metadata in an SQLite database. (There was quite a stir in the Mac community a few weeks ago when somebody discovered and blogged that you could substantially increase the speed of Apple Mail by running VACUUM on its database!) There are other popular mail user agents that also store either metadata or mail text or both in SQLite databases. But since I am under a bewildering array of NDAs and am not really sure what I can and cannot say, I'll say no more about that. :-) -- D. Richard Hipp [EMAIL PROTECTED] - To unsubscribe, send email to [EMAIL PROTECTED] -
[sqlite] Re: Default sqlite memory management policy
On 4/3/07, Rich Rattanni [EMAIL PROTECTED] wrote: All: I was wondering exactly how SQLite handles freeing memory used from the heap when compiled without SQLITE_ENABLE_MEMORY_MANAGEMENT? Will absolutely no memory be freed, or is there some default memory management scheme used? Let me explain my question better... SQLITE on my system has been compiled without the SQLITE_ENABLE_MEMORY_MANAGEMENT define. I have a thread that writes a hundred or so samples into a database every 30 seconds. I do not open and close the database pointer each time, but I do prepare and finalize a statement for each transaction. I have notices that the memory used by my program slowly but surely increases as the program runs (about 24 hrs sees a 40%+ increase in system memory). I have checked, and rechecked the program for any memory leaks on my part, but I have no found any obvious ones. I just wanted to know if sqlite, as compiled for my system, will use as much memory as it sees fit in a particular thread if compiled without SQLITE_ENABLE_MEMORY_MANAGEMENT? Can anyone answer this for me? -- Thanks in advance, Rich P.S. Sorry to repost, if there are no takers I will not repost again, I just thought my first message was lacking any real question so I wanted to clarify the original. - To unsubscribe, send email to [EMAIL PROTECTED] -
Re: [sqlite] Re: Default sqlite memory management policy
On Wed, 2007-04-04 at 23:36 -0400, Rich Rattanni wrote: On 4/3/07, Rich Rattanni [EMAIL PROTECTED] wrote: All: I was wondering exactly how SQLite handles freeing memory used from the heap when compiled without SQLITE_ENABLE_MEMORY_MANAGEMENT? Will absolutely no memory be freed, or is there some default memory management scheme used? Let me explain my question better... SQLITE on my system has been compiled without the SQLITE_ENABLE_MEMORY_MANAGEMENT define. I have a thread that writes a hundred or so samples into a database every 30 seconds. I do not open and close the database pointer each time, but I do prepare and finalize a statement for each transaction. I have notices that the memory used by my program slowly but surely increases as the program runs (about 24 hrs sees a 40%+ increase in system memory). I have checked, and rechecked the program for any memory leaks on my part, but I have no found any obvious ones. I just wanted to know if sqlite, as compiled for my system, will use as much memory as it sees fit in a particular thread if compiled without SQLITE_ENABLE_MEMORY_MANAGEMENT? Can anyone answer this for me? Defining the SQLITE_ENABLE_MEMORY_MANAGEMENT includes the following APIs in the build: int sqlite3_release_memory(int N); int sqlite3_set_soft_heap_limit(int N); See the comments above these two functions in sqlite3.h for details. SQLite should not leak memory whether this macro is defined or not. How large are the leaks you are seeing? Dan. - To unsubscribe, send email to [EMAIL PROTECTED] -
Re: [sqlite] Default sqlite memory management policy
Rich Rattanni [EMAIL PROTECTED] wrote: On 4/3/07, Rich Rattanni [EMAIL PROTECTED] wrote: All: I was wondering exactly how SQLite handles freeing memory used from the heap when compiled without SQLITE_ENABLE_MEMORY_MANAGEMENT? Will absolutely no memory be freed, or is there some default memory management scheme used? Let me explain my question better... SQLITE on my system has been compiled without the SQLITE_ENABLE_MEMORY_MANAGEMENT define. I have a thread that writes a hundred or so samples into a database every 30 seconds. I do not open and close the database pointer each time, but I do prepare and finalize a statement for each transaction. I have notices that the memory used by my program slowly but surely increases as the program runs (about 24 hrs sees a 40%+ increase in system memory). I have checked, and rechecked the program for any memory leaks on my part, but I have no found any obvious ones. I just wanted to know if sqlite, as compiled for my system, will use as much memory as it sees fit in a particular thread if compiled without SQLITE_ENABLE_MEMORY_MANAGEMENT? Can anyone answer this for me? SQLite does not leak memory, if that what you are asking. You do not need to compile with SQLITE_ENABLE_MEMORY_MANAGEMENT in order to prevent memory leaks. The SQLITE_ENABLE_MEMORY_MANAGEMENT macro is used to enable two APIs used for tighter control of memory on resource limited embedded devices: sqlite3_release_memory() sqlite3_soft_heap_limit() I recommend you run your program in valgrind to find out where the memory is leaking. -- D. Richard Hipp [EMAIL PROTECTED] - To unsubscribe, send email to [EMAIL PROTECTED] -
Re: [sqlite] Data integrity in extreme situations
--- [EMAIL PROTECTED] wrote: It has already been reported that Apple Mail keeps all its metadata in an SQLite database. (There was quite a stir in the Mac community a few weeks ago when somebody discovered and blogged that you could substantially increase the speed of Apple Mail by running VACUUM on its database!) VACUUM is one way to get the entire sqlite database into the OS disk cache. Here's another way: cat ~/Library/Mail/Envelope\ Index /dev/null The Apple Mail speedup in both cases is not as dramatic after a reboot, though. No need to miss a message. Get email on-the-go with Yahoo! Mail for Mobile. Get started. http://mobile.yahoo.com/mail - To unsubscribe, send email to [EMAIL PROTECTED] -
[sqlite] Re: SQL and SQLite pronounciation?
* Dennis Cote [EMAIL PROTECTED] [2007-04-04 22:30]: I prefer ess cue el and ess cue light myself. That’s what I say. Regards, -- Aristotle Pagaltzis // http://plasmasturm.org/ - To unsubscribe, send email to [EMAIL PROTECTED] -
